# US 2015/0144548 A1 · Tank Vent Filter With Downpipe

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- Number: US 2015/0144548 A1
- Document ID: US20150144548A1
- Status: Published application
- Kind: A1
- Application number: 14/547,680
- Filed: 2014-11-19
- Published: 2015-05-28
- Earliest claimed: 2013-11-20
- Assignees: Mann+Hummel GmbH
- Applicants: Mann+Hummel GmbH
- Inventors: Marcel Holzwarth; Daniel Schmid; Christian Vogt
- Web page: https://patentgrep.com/patent/US20150144548A1

## CPC

- B01D 46/2403: {characterised by the physical shape or structure of the filtering element}
- B01D 46/2411: {Filter cartridges}
- B01D 46/62: connected in series
- B60K 15/03504: {adapted to avoid loss of fuel or fuel vapour, e.g. with vapour recovery systems}
- B01D 2279/35: for venting arrangements
- B60K 2015/03236: {characterised by special filters, the mounting thereof}
- B60K 2015/03509: {with a droplet separator in the vent line}
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES

## Abstract

The invention relates to a tank vent filter (70) that guides tank contents that have inadvertently reached the tank vent filter (70) through a downpipe (80) past a first filter (78) of the tank vent filter (70). A contamination of the first filter (78) is thus prevented by means of a space-saving arrangement. The downpipe (80) and the first filter (78) are preferably arranged rotationally symmetrically around the longitudinal axis of the tank vent filter (70) in order to achieve an especially compact design of the tank vent filter (70).

## Claims

### Claim 1

A tank vent filter comprising:
an air inlet arranged along a vertically aligned filter longitudinal axis on a lower end of the tank vent filter;
an air outlet arranged on an upper end of the tank vent filter, the air outlet connectable to a tank;
a filter element having a first filter arranged between the air inlet and the air outlet;
wherein the air outlet leads on its lower end to a downpipe that is fluidly connected to the air inlet.

### Claim 2 (depends on 1)

The tank vent filter as set forth in claim 1, wherein
the first filter is arranged indirectly or directly encircling around the downpipe.

### Claim 3 (depends on 1)

The tank vent filter as set forth in claim 1, further comprising
a second filter arranged fluidly between the downpipe and the air inlet.

### Claim 4 (depends on 3)

The tank vent filter as set forth in claim 3, wherein
the second filter is fuel-permeable and/or permeable for urea solutions.

### Claim 5 (depends on 3)

The tank vent filter as set forth in claim 3, wherein
the second filter is air-permeable and has a greater flow resistance for air in comparison to the first filter.

### Claim 6 (depends on 1)

The tank vent filter as set forth in claim 1, wherein
the downpipe has at least one downpipe through recess embodied transverse to the longitudinal axis between interior space of the downpipe and the first filter.

### Claim 7 (depends on 6)

The tank vent filter as set forth in claim 6, wherein
the downpipe through recess extends through a wall of the downpipe, extending between and fluidically connecting the interior space of the downpipe and the first filter.

### Claim 8 (depends on 1)

The tank vent filter as set forth in claim 1, wherein
the downpipe is fluidly connected to a collecting space.

### Claim 9 (depends on 8)

The tank vent filter as set forth in claim 8, wherein
the collecting space is adapted to be drainable through a valve.

### Claim 10 (depends on 9)

The tank vent filter as set forth in claim 9, wherein
the tank vent filter is substantially axially symmetrical to its longitudinal axis.